I heard there is like a book in the bhaal saga and the bhaal child is called Abdel am I right? If so what class is he I reaaaaallly want to know!

Not that I know of. Instead of trying to play somebody else that's completely fictional, why don't you play somebody completely fictional that you made up? I find it much more interesting to play a character concept that I invented than somebody else's idea. Drizzt is cool, but my dwarven barbarian is much cooler. :D

I wouldn't recommend people reading books about games that came out before the book. It would really spoil the whole thing, Baldur's Gate is a ROLEPALYING game for christ's sake...

But there is a series on the BG saga. I don't know for certain what class he is, but I believe it was fighter. If you have the Tales of the Sword Cost expansion for BG1, load the mission pack save. The main character there is him.